Spent wings on Trico spinners, yes, but my favorite use is for the body and shell of an Upper Midwest fly called a Brown Hackle Peacock Beetle, originated by Ross Mueller. I tie them in a couple of sizes (12 and 16), and they are great early season flies, imitating a Dung Beetle.
How does it differ from plain Antron?
Joe
Thinner, a bit kinkier, with more sheen. Easy to work with. I'm surprised it hasn't sold well.
I love the stuff. It's my favorite material for wing posts on parachute flies.
Chuck